Zhou Yinong, Liu Feng
Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States.
Nano Lett. 2021 Jan 13;21(1):230-235. doi: 10.1021/acs.nanolett.0c03579. Epub 2020 Dec 2.
Using first-principles calculations, we investigate the electronic and topological properties of an antiferromagnetic (AFM) superatomic graphene lattice superimposed on a bipartite honeycomb lattice governed by Lieb's theorem of itinerant magnetism. It affords a concrete material realization of the AFM honeycomb model with a Dirac Mott insulating state, characterized by a gap opening at the Dirac point due to inversion symmetry breaking by long-range AFM order. The opposite Berry curvatures of the and ' valleys induces a circular dichroism (CD) Hall effect. Different from the valley Hall effect that activates only one valley, the CD Hall effect activates carriers from both and ' valleys, generating the opposite directions of transversal Hall currents for the left- and right-handed circularly polarized light, respectively.
通过第一性原理计算，我们研究了叠加在由利布巡游磁定理支配的二分蜂巢晶格上的反铁磁（AFM）超原子石墨烯晶格的电子和拓扑性质。它为具有狄拉克莫特绝缘态的AFM蜂巢模型提供了一种具体的材料实现，其特征是由于长程AFM序破坏了反演对称性，在狄拉克点处出现能隙。K和K'谷相反的贝里曲率诱导了圆二色性（CD）霍尔效应。与仅激活一个谷的谷霍尔效应不同，CD霍尔效应激活来自K和K'谷的载流子，分别为左旋和右旋圆偏振光产生相反方向的横向霍尔电流。
